Today is the eighth of December and door eight is therefore now available to open on the BBC's official Doctor Who advent calendar. Behind the door is a new playable game called Cosmic Collider. The aim of the game is to destroy all of the blocks without losing your three given lives. There are six levels in total and a wallpaper is made available as a prize after each level has been completed. An exclusive script extract from The Next Doctor features on the final bonus wallpaper and instructions on how to play the game can be found here along with a link to the actual game itself. I completed the game earlier and have uploaded all six wallpapers elsewhere online for anyone who wants to view them. They can be viewed in numerical order; here, here, here, here, here and here however please be aware that the fourth wallpaper is a potential spoiler.